[asterisk-users] Re: Bandwidth requirements

[J. Oquendo]

Benny Amorsen wrote:
>>>>>> "rJ" == raphael Jacquot <sxpert at sxpert.org> writes:
>>>>>>             
>
> rJ> ATM cell tax is actually 10% as there's 5 header bytes for each 53
> rJ> bytes cell,
>
> For VoIP the cell tax is much larger. In the example, each RTP packet
> contains 20 useful bytes and 40 bytes IP overhead. 60 bytes doesn't
> fit in one cell, so you end up with 106 bytes at the ATM layer to
> transport 20 bytes of G.729. The ATM-caused overhead is thus 46 bytes
> per voice packet, thereby making the needed bandwidth 77% larger.
>
>   

CRTP solves this issue (40byte waste)

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J. Oquendo
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